Market forces
Big-Windy, market forces. Whether 'tis right or wrong, I'm afraid that is what is at work here.
Putting out "messages" to employers can only be done when the employer finds that they can't recruit the right person (or sufficiently qualified) for the salary offered. If they can, then the remuneration must, ipso facto, be about right.
Had I the qualifications, I would do the job for the package offered. If I would be selling out for others, then sorry; life's tough sometimes. As was pointed out, it's a nice area (and not expensive) to live so surely there are other aspects than just salary that count towards whether a job role is acceptable or not. Quality of life, the team with whom you work and the environment etc etc.
Everyone has their price; obviously I am cheaper than some
Cheers
Whirls